Habib bin Abi Thabit narrates from some of the children of Sayyiduna Abu Rafi' (may Allah be pleased with him) that they said: Sayyiduna Ali (may Allah be pleased with him) used to pay the zakah on our wealth while we were orphans.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7342